3 years ago

Which expression is equivalent to the given expression?

Mathematics

1 answer:

Romashka [77]3 years ago

3 0

Step-by-step explanation:

3x-21+4x²-8x+36

4x²-5×+15

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3 years ago

What two positive real numbers whose product is 21 have the smallest possible sum?

GalinKa [24]

Answer:

$x=\sqrt{21}$

$y=\sqrt{21}$

Step-by-step explanation:

Let x and y are the two positive real numbers

product of two numbers is 21

$x y=21$

$y=\frac{21}{x}$

The sum of the two numbers is f(x) =x+y

Replace y with 21/x

$f(x) =x+\frac{21}{x}$

we need to find smallest possible sum , so we take derivative using power rule

$f'(x)= 1-\frac{21}{x^2}$

when sum is minimum then the derivative is equal to 0

$0= 1-\frac{21}{x^2}$

$0=\frac{x^2-21}{x^2}$

multiply both sides by x^2

$x^2-21=0$

$x^2=21$

Take square root on both sides

$x=\sqrt{21}$

$y=\frac{21}{x}$

$y=\frac{21}{\sqrt{21}}$

$y=\sqrt{21}$

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4 years ago

What are the partial profucts of 42x28

Alona [7]

I multipled 42*28 and i got 1176

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3 years ago

A large brine tank containing a solution of salt and water is being diluted with fresh water. The relationship between the elaps

rewona [7]

Answer:

41.04

Step-by-step explanation:

thats the answer on khan academy :3 i hope this helps

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3 years ago

Miranda le debe $120.00 a max .Le paga 30% de lo que le debe ¿cuanto le falta pagarle?

IceJOKER [234]

Answer:

Step-by-step explanation:

el 10% de 120= 12. 120-12= 108

el 20% de 120=24. 120-24=96

el 30% de 120=36. 120-36=84

el 40% de 120=48. 120-48=72

el 50% de 120=60. 120-60=60

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3 years ago

Read 2 more answers